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HP 3457A mains voltage setting

 

Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)

Thanks a lot
 

Not certain about the settings (shouldn't it be in the manual?) but the fuse is generally 1/2 the 120 volt rating, and should be listed on the back.? I know that Tek generally has a "gross" setting, 120/240 and then a low/med/high adjustment for variations within that range.? For USA 120 volts, you generally want the high setting.

I'd suspect that HP did much the same, it makes too much sense.

Harvey

On 6/9/2021 12:25 PM, cheater cheater wrote:
Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)

Thanks a lot
tmillermdems
 

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On 6/9/2021 12:25 PM, cheater cheater wrote:
Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)

Thanks a lot


This email has been checked for viruses by Avast antivirus software.


 

On Wed, Jun 9, 2021 at 09:26 AM, cheater cheater wrote:
Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)

Thanks a lot
Looking at a picture of 3457A, circular one is the fuse holder. The picture I found says 80mA for 220/240 and 200mA for 100/120mA next to it, in consistent with the message from "tmillermdems".
Ozan
 

Crap... does that mean I need a different fuse holder before I can
start using this? The unit came from the US and I am in Europe.

On Wed, Jun 9, 2021 at 7:34 PM Ozan <ozan_g@...> wrote:

On Wed, Jun 9, 2021 at 09:26 AM, cheater cheater wrote:

Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)

Thanks a lot

Looking at a picture of 3457A, circular one is the fuse holder. The picture I found says 80mA for 220/240 and 200mA for 100/120mA next to it, in consistent with the message from "tmillermdems".
Ozan
 

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It just means that you need to change the switch position and change the fuse itself, NOT the fuseholder.
Richard

From: [email protected] <[email protected]> on behalf of cheater cheater via groups.io <cheater00social@...>
Sent: Wednesday, June 9, 2021 2:12 PM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3457A mains voltage setting
?
Crap... does that mean I need a different fuse holder before I can
start using this? The unit came from the US and I am in Europe.

On Wed, Jun 9, 2021 at 7:34 PM Ozan <ozan_g@...> wrote:
>
> On Wed, Jun 9, 2021 at 09:26 AM, cheater cheater wrote:
>
> Hi all, I've noticed that my 3457A has two settings for the mains
> voltage. One is a circular selector with a flat head screwdriver slot,
> the other is a pair of sliders. I need to change it from US to Europe.
> Should I be changing both? Do I need to change anything else? (eg
> fuse?)
>
> Thanks a lot
>
> Looking at a picture of 3457A, circular one is the fuse holder. The picture I found says 80mA for 220/240 and 200mA for 100/120mA next to it, in consistent with the message from "tmillermdems".
> Ozan
>





 

On Wed, Jun 9, 2021 at 12:12 PM, cheater cheater wrote:
Crap... does that mean I need a different fuse holder before I can
start using this? The unit came from the US and I am in Europe.

---
Most likely the fuse inside is a standard fuse. Just push the cap in with a flat screwdriver and rotate counterclockwise to remove and inspect the fuse. If you want you can paint the fuse holder cap black with a permanent marker?to match the original color for 220/240V (gray->110/120V, black->220/240V) after placing the correct fuse.

Ozan
 

Thanks everyone. The cap seems to have some sort of positioning arrow
that indicates either 120 or 240 mains AC. But I guess that doesn't
matter.

On Wed, Jun 9, 2021 at 9:47 PM Ozan <ozan_g@...> wrote:

On Wed, Jun 9, 2021 at 12:12 PM, cheater cheater wrote:

Crap... does that mean I need a different fuse holder before I can
start using this? The unit came from the US and I am in Europe.

---
Most likely the fuse inside is a standard fuse. Just push the cap in with a flat screwdriver and rotate counterclockwise to remove and inspect the fuse. If you want you can paint the fuse holder cap black with a permanent marker to match the original color for 220/240V (gray->110/120V, black->220/240V) after placing the correct fuse.

Ozan
 

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On 2021-06-10, at 13:52, cheater cheater <cheater00social@...> wrote:

Thanks everyone. The cap seems to have some sort of positioning arrow
that indicates either 120 or 240 mains AC. But I guess that doesn't
matter.

I understand why you might be misreading that. ?
See Figure 1; as you can see I’m in 230-V-land.
The grey thing is a fuse holder (Figure 2).
You want to put in an 80 mA timed (tr?ge) fuse, “80 mAT”.
Note that this is a 3AG [0] US automotive form factor (6.3x31.8 mm), which is harder to get outside NA than the ubiquitous 5x20 mm glass fuses.

Oh, and if the backplane looks like I’ve been at it with a pair of end-cutters, that is because that is indeed what I did to get out the Schaffner line filter *before* it exploded.

PUBLIC SERVICE ANNOUNCEMENT:
You really **never** want to apply line voltage (and certainly not 230 V) to a HP 3457A that has been in storage for a while [1]. ?
Get a replacement [2] for the line filter and get familiar with end-cutters, hacksaws, drills, whatever you like to remove the rivets that hold in the original line filter bomb.

Grü?e, Carsten (I think I have 5 HP 3457A meters, and a lot of end-cutters)


[0]:
[1]:
[2]:?
Of course, you can decide you are angry at Schaffer’s mistake 35 years ago and buy from a different source.

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